<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
</head>
<body>
  <div id="app">
    <ul>
      <li v-for="i in mag">{{i}}</li>
    </ul>
    <button @click="fn">走一走</button>
  </div>
  <script>
  const app = new Vue({
    el:'#app',
    data:{
        mag:['帅哥','美女','程序员']
    },
    methods: {
        fn(){
            this.mag.push(this.mag[0])
            this.mag.splice(0,1)
            console.log('测试');
        }
    }
  })
  </script>
</body>
</html>